Elastic Properties of Spark Plasma Sintered (SPS) ZrB₂/SiC-Sm₂Zr₂O₇ Composites

Abstract:

Due to extremely low oxygen transportation at elevated temperature, samarium zirconate (Sm₂Zr₂O₇) with pyrochlore structure was introduced into ZrB₂-based functional gradient composites as oxygen insulation. The elastic properties of composites with different phase ratio were investigated in this study. A series of nearly-fully dense ZrB₂-based composites with different Sm₂Zr₂O₇ content was consolidated by spark plasma sintering (SPS) technology. The microstructure and phase compositions were characterized by scanning electronic microscope (SEM) and X-ray diffraction respectively. The dynamic elastic properties were obtained by resonance method at room temperature. The results revealed that the addition of Sm₂Zr₂O₇ can significantly improve its densification for the refractory diboride, which mainly caused by the high sintering activity of Sm₂Zr₂O₇. Young’s modules of the series of composites obviously decreased with the increasing content of Sm₂Zr₂O₇. The low Young’s modulus of Sm₂Zr₂O₇ was the main reason. The Young’s modules of the series of composites were calculated theoretically. The experimental results matched the theoretical data well. A little deviation appeared due to the continuous structure of Sm₂Zr₂O₇ in the composites.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 474-478
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.474
• Online since: June 2012
• Authors: Zhen Yu Yan, Shi Zhen Zhu, Qiang Xu, Ying Liu
• Keywords: Elastic Property, Samarium Zirconate, SPS, Zirconium Diboride

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